Automatic jig grinding attachment



5 Sheets-Sheet 2 Filed Aug. 5, ,1960

INVENIOR. DMYTRo SzFrFRH/v HT TOR/VE Y May 22, 1962 D. szAFRN 3,035,376

AUTOMATIC JIG GRINDING ATTACHMENT INV EN TOR.

DMYTRO SzHFRH/v ffmmg Fl TTORNEY United States Patent Ofice Patented May 22, 1h62 3,035,376 AUTGMATIC JIG GRENDING ATTACHMENT Dmytro Szafran, New Britain, Conn., assignor to Precise Products Corporation, a corporation of Wisconsin Filed Aug. 5, 1960, Ser. No. 47,839 7 Claims. (Cl. 531-90) This invention relates to machine tools, and is directed more particularly to an improved automatic grinding attachment for use in a jig borer, a vertical or horizontal milling machine, a boring mill, an internal grinder, a drill press, or similar machine for grinding cylindrical holes or straight slots.

The principal object of this invention is to provide an automatic grinding attachment of the above nature which is detachably connected directly to the power output shaft of the machine with which it is to be used, and which embodies an independently energized high speed electric motor, the shaft of which -may be adjustably displaced laterally with respect to the axis of the machine output shaft, whereby the diameter of the cylindrical holes or width of the slots to be ground in the Work piece may be varied as desired.

A more particular object of this invention is to provide an automatic tool grinding attachment of the above nature which is compact, which may be automatically or manually operated, which is versatile, inexpensive to manufacture, ornamental in appearance, easy to install and manipulate, foolproof, and very eflicient and durable in use.

Other objects, features and advantages of the invention will be apparent from the following description, when read with reference to the accompanying drawings, wherein there has been illustrated one form in which the invention may conveniently be embodied in practice.

In the drawings,

FIG. 1 represents an elevational view of an automatic jig grinding attachment device embodying the invention.

FIG. 2 is a top plan View of the same.

FIG. 3 is a partial vertical cross-sectional view taken along the broken line 3 3 of FIG. l, `looking in the direction of the arrows, and illustrating details of the lateral shaft adjusting mechanism.

FIG. 4 is a cross-sectional view, taken on the line 4-4 of FIG. 3, looking upwardly, and showing the central dial indexing ratchet ring and its actuating pawl.

FIG. 5 is a cross-sectional view, taken on the line 5-5 of FIG. 3, looking downwardly, and showing the ratchet pinion and the cam operated pawl'for actuating it.

FIG. 6 is a cross-sectional View, taken along the line 6-6 of FIG. 4, illustrating the mechanism for simultaneously causing rotation of the indicating dial and the pinion ratchet ring which actuates the feed screw for laterally shifting the lower section of the head.

FIG. 7 is a cross-sectional view, taken along the broken line 7-7 of FIG. 4, illustrating the appearance of the top stationary dial, the dial ratchet, and the push button assembly.

FIG. 8 is a side view of the cam arm and the screw feed ratchet and its pinion, shown separately.

FIG. 9 is a bottom view of the same.

FIG. l0 is a partial sectional View, taken along the line 1li-1t) of FIG. 5, on a larger scale, showing the screw feed pinion ratchet and its pawl, and the horizontal eccentric shaft.

FIG. l1 is a partial sectional view, taken along the line 11-11 of FIG. l0, and on a larger scale, showing the two positions of the pawl as it appears when engaged by the ratchet pinion for automatic operation, and disengaged therefrom for manual operation, respectively.

FIG. l2 is a sectional view, takenl long the line 12--12` of FIG. 11, of the U-shaped spring clip which holds the eccentric shaft selectively in position for manual or automatic operation.

Referring now to the drawings, in which like reference numerals denote corresponding parts throughout the several views, the numeral 1 indicates the primary body portion or upper section of the head H, and the numeral 2 indicates the secondary body portion or lower section of said head, which is laterally adjustable with respect to said upper section 1.

The primary body portion is adapted to be mounted upon a machine tool spindle or other tool head as by means of a mounting arbor, shown in dotted lines in FIGURE l. This mounting means may be varied.

The numeral 3 indicates a top rotary ring dial having a pair of opposed upstanding pins 4 on the top thereof, by which the ring dial 3 is adapted to be manually operated with reference to a zero mark 3a on a floating cover 6 secured to a cylindrical outer feed ring or member 7, for convenience in manually setting said dial.

The numeral 5 indicates a centra-l ratchet ring which is secured to the top rotary ring dial 3. The numeral 8 indicates a circular mounting plate fitted within the ring 7 and secured to said cover 6 and to said ring 7 by screws 9 and 10, respectively.

Provision is also made of a vertical push button 12 mounted in the top cover 6, said. push button being reciprocable within a tubular guide 13, and being urged upwardly by a coiled spring 14 (FIG. 6). The push button 12 has a pin which is adapted to be projected down into the path of the cam 22a when the button is depressed and to form an abutment which compels the cam 22a to swing sidewise in passing the pin. The numerals 15 and 16 (FIG. 5) indicate a pair of rectangular holding blocks secured by socket screws 15a, 16a, respectively, to opposite outer portions of a ange 16h of the upper part 1 of the head H.

The numeral 17 (FIG. 4) indicates an arcuate wing cam located underneath and adapted to be engaged by the pin 23, said wing cam having a pair of outstanding lugs 17a and 17b.

The prong 17a of the wing cam 17 is pivotally connected to a vertical upstanding shoulder pin 18 and the prong17b of said wing earn 17 is connected by a shoulder pin 20 to a pawl 19, the point of which is adapted to engage the dial ratchet ring 5. The pawl 19 is urged counterclockwise by a U-shaped wire spring 21 (FIG. 4).

Provision is also made of an arcuate arm 22 (FIGS. 5, 8, 9), carrying a substantially triangular arcuate cam 22a, said arm 22 being pivoted at one end on a pin 29b which is at the axis of a feed screw operating pinion 29. The cam 22a is urged clockwise by a curved wire spring 23a (FIG. 5), the end of which engages one end of said triangular cam 22a having a pin 23 upstanding therefrom. The pin 23 presses against the wing cam 17 rwhen the push button is depressed, causing said cam to operate the pawl 19 which actuates the ratchet 5. An additional U-shaped wire spring 24 is also provided, which engages a pawl 25 (FIGS. 5 and 9), mounted on a pivot pin 26 (FIGS. 9' and 1l). The pawl 25 has a depending pin 25a which is adapted to be engaged by a reduced eccentrically mounted horizontal pin 27a extending from a horizontal lock shaft 27, as clearly shown in FIGS. 5, 9, 10, and l1, and which serves to set the apparatus into condition for transverse adjustment of the lower assembly 2. The outer end of the shaft 27 has an indicating mark 27b (FIG. 1)` which may be moved selectively into alignment with a pair of opposite words In and Out marked on the upper fixed part 1 of the head H. A U-shaped spring clip 28 has inwardly bent converging ends which are adapted to t into sockets 281; and 28C in a circumferential groove 3 28a (FIGS. l1 and l2) in the shaft 27. It biases said shaft selectively in In or Out positions, as desired, the pawl 25 engages the teeth of a ratchet 29a.

The numeral 30 indicates a horizontal yoke member (FIGS. 1 and 3) in which a small face dial 33 is mounted to rotate adjacent a Vernier scale 33a, said yoke member being attached by screws 31 (FIG. 5) to the upper part 1 of the head H. The face dial 33 permits manual adjustment of a horizontal micro-feed screw 34 (FIG. 3) for manual operation. The dial 33 is connected to a bevel gear 34a having a horizontal side pin 35 which serves to lock the bevel gear 34a to the feed screw 34. The numeral 36 indicates a tubular nut within which the microfeed screw 34; is mounted and the tubular nut 36 is fastened to the lower portion or part 2.

The lower part 2 of the head H of the machine is embraced by a perforated shell 39, within which is a cylindrical air filter and cooler d() seated on a partition 41. The numerals 42 and 43 indicate respectively a pair of ilat electrical insulation rings, the numeral 44 indicates a pair of electrical conductor rings, 45 indicates a bottom fibrous insulating plate, and 46 indicates a stationary steel ring.

Electric current is supplied to the jig grinding attachment through a cord adaptor 47 (FIG. 1); the numeral 48 indicates a cord connected to a power line, and the numeral 49 (FIG. 3) indicates a brush assembly having a conical ring nut 56 connected to a motor housing 51, the motor having a depending spindle 52 to which is connected an abrasive grinding wheel 53.

Operation In operation, the zero on the scale of the top ring dial 3 may be set opposite the zero mark 3a on the cover 6 to indicate the starting position. The shaft adjusting unit may then be set into condition for automatic operation, by properly rotating the horizontal shaft 27, by a polygonal wrench inserted in a polygonal socket in the outer end of said shaft so that the indicating mark 27b registers with the word In (FIG. 1). The pawl 25 will then engage the ratchet 29a and while holding the ring 7 in one hand while the remainder of the head is rotating, the push button 12 will be depressed with the other hand causing the cam arm 22 to rock about its pivot 29b. The pawl 25 will then automatically successively index the ratchet pinion 29, rotating the bevel gear 34a and turning the micro-feed screw 34, to shift the lower part 2 of the head H laterally to the desired adjusted position. It will be understood that the push button 12 must be held in depressed position to act on the rotating cam 22a with which it is aligned, as otherwise said push button 12 will be clear from engagement therewith.

When it is desired to manually adjust the lower part 2 of the head laterally, the shaft 27 will be turned by the polygonal wrench to bring the indicating mark 27b to the Out position. The feed screw 34 may thus be operated by means of a polygonal wrench inserted in the socket of the face dial 33. When the shaft 27 has been turned to bring the indicating mark 27b to the Out position, the feed screw 34 may be turned in either direction without interference from the pawl 25.

While there has been disclosed in this specification one form in which the invention may be embodied in practice, it is to be understood that this form is shown for the purpose of illustration only, and that the invention is not limited to the specific disclosure but may be modified and embodied in various other equivalent forms without departing from its spirit.

In short, the invention includes all the modifications and embodiments coming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new and for which it is desired to secure Letters Patent is:

1. In a device of the class described, a primary body portion having mounting means by which is adapted to be mounted on a vertical axis, a secondary body portion mounted on the primary portion and guided for lateral movement relative thereto, said secondary portion being adapted to support a tool, a horizontal feed screw connecting said body portions and being rotatable for producing said lateral guided movement of the secondary portion relative to the primary portion, a feed member rotatably mounted on the primary portion, pawl and ratchet means for advancing said feed screw in predetermined steps, said pawl and ratchet means lying in substantially a horizontal plane, cone gears between the ratchet means and the feed screw, an actuating member for said pawl and ratchet means carried by said primary body portion, and a normally spring retracted movable abutment member carried on the feed member and adapted to be manually projected into the path of the actuating member whereby when the feed member is held against rotation and the abutment member is projected into the path of the actuating member rotation of the primary body portion will cause actuation of the pawl and ratchet means to advance the feed screw by a predetermined amount for each rotation.

2. In a device of the class described, a primary body portion having central mounting means by which said body portion may be rotated, a secondary body portion mounted on the primary body portion and guided for lateral movement relative thereto, said secondary portion being adapted to support a power driven grinding wheel, a feed screw connecting said body portions and being rotatable for producing said guided lateral movement of the secondary portion relative to the primary portion, a feed member rotatably mounted on the primary portion, said feed member being adapted to be held against rotation by the hand of the operator, an indicator member movably mounted on the feed member, there being indicia for indicating relative motion of the indicator member relative to the feed member, pawl and ratchet means for advancing said feed screw in predetermined eps carried by said primary body portion, an actuating member for said pawl and ratchet means carried by said primary body portion, a movable abutment member carried by the feed member and adapted to be manually projected into the path of the actuating member, a second pawl and ratchet means comprising ratchet teeth connected to said indicator member, a cooperating pawl carried by the feed member and means for transmitting motion from said actuating member to said second pawl means for advancing said indicator member when the said actuating member is engaged by the abutment member, whereby the operator can see the steps of movement of the indicator member relative to the feed member while he holds the feed member against rotation.

3. The combination of claim 2 further characterized by the actuating member having a double inclined engaging surface for engaging the abutment member, whereby the first pawl and ratchet member will be caused to operate by relative rotation of the feed member and the primary portion in either direction of rotation.

4. In a device of the class described, a primary body portion having mounting means, a secondary body portion mounted on the primary portion and guided for lateral movement relative thereto, said secondary portion being adapted to support a tool, a feed screw connecting said body portions and being rotatable for producing said lateral guided movement of the secondary portion relative to the primary portion, a feed member rotatably mounted on the primary portion, pawl and ratchet means for advancing said feed screw in predetermined steps, an actuating member for said pawl and ratchet means carried by said primary body portion, and a movable abutment member adapted to be manually projected into the path of the actuating member whereby when the feed member is held against rotation and the abutment member is projected into the path of the actuating member, rotation of the primary body portion will cause actuation of the pawl and ratchet means to advance the feed screw by a predetermined amount for each rotation, an indicating dial carried on the upper surface of the primary body portion radially inside the feed member, and a separate pawl and ratchet means for actuating said indicating dial, said second pawl and ratchet means being also actuated by said actuating means.

5. In a device of the class described, a primary body portion having mounting means, a secondary body portion mounted on the primary portion and guided for lateral movement relative thereto, said secondary portion being adapted to support a tool, a feed screw connecting said body portions and being rotatable for producing said lateral guided movement of the secondary portion relative to the primary portion, a feed member rotatably mounted on the primary portion, pawl and ratchet means for advancing said feed screw in predetermined steps, an actuating member for said pawl and ratchet means carried by said primary body portion, and a movable abutment member adapted to be manually projected into the path of the actuating member whereby when the feed member is held against rotation and the abutment member is projected into the path of the actuating member rotation of the primary body portion will cause actuation of the pawl and ratchet means to advance the feed screw by a predetermined amount for each rotation, manually operable means disposed in the primary body portion and extending to the outer lateral surface thereof for disconnecting the pawl and ratchet means from said feed screw, said manually operable means comprising a shaft carrying a wrench-engaging socket portion at its outer end, and being adapted to be rocked from one angular position to another for connection of said pawl and ratchet means to said feed screw in one position and for disconnection thereof in the other position. v

6. In a device of the class described, a primary body portion having mounting means, a secondary body portion mounted on the primary portion and guided for lateral movement relative thereto, said secondary portion being adapted to support a tool, a feed screw connecting said body portions and being rotatable for producing said lateral guided movement of the secondary portion relative to the primary portion, a feed member rotatably mounted on the primary portion, pawl and ratchet means for advancing said feed screw in predetermined steps, an actuating member for said pawl and ratchet means carried by said primary body portion, and a movable abutment member adapted to be manually projected into the path of the actuating member whereby when the feed member is held against rotation and the abutment member is projected into the path of the actuating member rotation of the primary body portion will cause actuation of the pawl and ratchet means to advance the feed screw by a predetermined amount for each rotation, manually operable means disposed in the primary body portion and extending to the outer lateral surface thereof for disconnecting said pawl and ratchet means from said feed screw, said disconnecting means comprising a shaft carrying a wrench engaging portion at its outer end and having at its inner end an eccentric engageable with the pawl of said pawl and ratchet means, and spring means biasing said shaft in either of two predetermined positions.

7. The combination of claim 1 wherein the actuating member has a double inclined surface for engaging the abutment member whereby relative rotation of the feed member and the primary body portion with respect to each other in either direction will cause operation of said actuating member.

References Cited in the le of this patent UNITED STATES PATENTS 1,839,253 Olofson Jan. 5, 1932 12,209,867 Wohlhaupter July 30, 1940 2,405,748 Johnson Aug. 13, 1946 2,529,342 ROSS Aug. 29, 1950 2,901,935 Keller et al. Sept. 1, 1959 

